https://doi.org/10.1140/epjb/e2018-80536-8
Regular Article
Strong electron–phonon interaction and colossal magnetoresistance in EuTiO3
Department of Physics, National University of Singapore,
Singapore
117551,
Republic of Singapore
a e-mail: a0112308@u.nus.edu
Received:
21
September
2017
Received in final form:
2
December
2017
Published online: 12
February
2018
At low temperatures, EuTiO3 system has very large resistivities and exhibits colossal magnetoresistance. Based on a first principle calculation and the dynamical mean-field theory for small polaron we have calculated the transport properties of EuTiO3. It is found that due to electron–phonon interaction the conduction band may form a tiny polaronic subband which is close to the Fermi level. The tiny subband is responsible for the large resistivity. Besides, EuTiO3 is a weak antiferromagnetic material and its magnetization would slightly shift the subband via exchange interaction between conduction electrons and magnetic atoms. Since the subband is close to the Fermi level, a slight shift of its position gives colossal magnetoresistance.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2018